Osmosis and Water Balance in Cells

Part A

What name is given to the process by which water crosses a selectively permeable membrane?

	osmosis
	passive transport
	phagocytosis
	pinocytosis
	diffusion

Correct

Osmosis is the passive transport of water.

Part B

This cell is in a(n) _____ solution.

	isotonic
	hypertonic
	hypertonic or isotonic
	hypotonic and isotonic
	hypotonic

Correct

There is a greater concentration of solute outside the cell.

Part C

You know that this cell is in a(n) _____ solution because the cell _____.

	hypertonic ... lost water
	hypotonic ... swelled
	hypotonic ... shrunk
	hypertonic ... gained water
	isotonic ... neither lost nor gained water

Correct

A cell will gain water when placed in a hypotonic solution.

Part D

Click on the cell to start the animation. This plant cell is _____.

	losing water
	hypertonic solution
	lysing
	in an isotonic solution
	in a hypotonic solution

Correct

In a hypotonic solution plant cells experience a net gain of water and become turgid.

Part E

You know that this cell is in a(n) _____ solution because it _____.

	hypotonic ... is turgid
	hypertonic ... gained water
	hypertonic solution ... lost water
	hypotonic ... lysed
	hypertonic ... lysed

Correct

A cell will lose water when placed in a hypertonic solution.